Trigger oscilloscope EN 9.5.3 Video trigger Video triggers can be used to capture complex waveforms of most standard analog video signals as well as HD video signals. The trigger circuit can detect the vertical and horizontal intervals of the waveform and generates a trigger based on the selected video trigger setting. This series of oscilloscopes supports NTSC (National Television Stands Committee) and PAL. 1. Click the trigger area in the lower right corner of the screen to enter the Trigger menu. 2. Click Video on the left side of the menu. 3. Click Source and select CH1 ~ CH4 as the trigger source. 4. Click Mode and select trigger mode (automatic, normal, single). 5.
Click Holdoff to adjust the trigger hold-off. 6. Click Standard and select the desired video standard. This series of oscilloscopes support video standards: NTSC, PAL, HDTV720p, HDTV1080p, HDTV1080i. 7. Click Sync , select the required field or line (scan line, line number, odd field, even field, all fields) to trigger the signal. 8. Click Line No. to set the line number in the field to trigger. 9. Click Polarity and select the trigger polarity (positive and negative). Positive: Triggered when a signal with positive polarity pulse width occurs. Negative: Triggered when a signal with negative polarity pulse width occurs.
Figure 9.4 Video trigger menu 9.5.4 Slope trigger Slope trigger sets the positive or negative slope trigger of the oscilloscope from one level to another within a specified period of time. As shown in the figure below, the time difference between the two points (A and B) where the high and low trigger levels intersect the rising (falling) edge of the waveform is defined as the positive (negative) slope time. Tablet1000 User manua l Copyright © Qingdao Hantek Electronics Co., LTD 42